Cutting machine for paper, cardboard and the like provided with automatic means for feeding the material to be cut



G. SCHMIDT CUTTING MACHINE FOR PAPER, CARDBO "-D, AND THE LIKE PROVIDED WITH AUTOMATIC MEANS FOR FEEDINk Filed March 23, 1931 HE MATERIAL TO BE CUT 2 Sheets-She et 1 lnvenfo s. SCHMIDT 1,996,591 9 ND THE LIKE PROVIDED WITH April 2, 1935.

CUTTING MACHINE FOR PAPER, CARDBOARD, A

AUTOMATIC MEANS FOR FEEDING THE MATERIAL TO BE CUT 2 Sheets-Sheet 2 Filed March 23, 1931 Patented Apr. 2, 1935 1 995 UNITED STATES PATENT OFFI'CE CUTTING MACHINE FOR PAPER, OARD- BOARD AND THE LIKE PROVIDED WITH AUTOMATIC MEANS FOR FEEDING THE MATERIAL TO BE CUT Gerhard Schmidt, Leipzig, Germany, assig l to 7. Karl Biasosch, Leipliz, Germany ApplicationMarch 23, 1931, Serial No.- 524,614

3 Claims. (CL 2719-54) A The present invention relates to cutting or movement is compensated for by the action of severing machines for paper, cardboard and the the resilient intermediate member so that the like provided withadevice for automatically'feedcoupling remains in a reliable condition of ening the material to be out. In cutting machines easement; I

5 for paper, cardboard and the like, devices for the A preferred constructional form according to 5 automatic feed of the material are known in the inventionis illustrated by way of example on which an intermittent feed is effected by means the accompanying drawings, in which: of a friction coupling adapted to be engaged and Fig.1 is a planand disengaged, and wherein the engaging or disen- Fig. 2 is an elevation drawn to a larger scale gaging operation takes place before the coniand partly broken off, of a cutting machine 10 mencement or after the termination of the feedequipped with the device according to the invening movement in such manner that the said ention. gaging or disengaging operation is independent In both figures of the drawings the details of of the feeding movement. In order to maintain construction which are not essential for the comthe coupling in the engaged position the forked p eh n's on of th inv t n ar om tt d. 15 lever operating the said coupling is held in its Referring to the drawings the reference numerend position corresponding to the engaged posials 34 and 35 denote two frame supports between tion of the said coupling by means of a stop memwhich a horizontal op ra in table 36 and a knifeber or lever which comes into position in front beam 31 provided Wit knife and arranged of the said forked lever as soon as this latter has so as to be movable in a vertical dire t r 20 arrived in the end position corresponding to the rran ed in known manner. engagement of the coupling, and thereby prevents A ra Pin I pr vided on a crank disk 2 which the lever from executing a return movement. In is rigidly mounted n a r nk shaft 3 lournflcd order, however, that the stop member should be in the frame pp 34 transmits yof a able to come into position without hindrance in connecting rod 4 and a swingin 9; r p- 25 front of the forked lever of the coupling it is l'ooating motion to /s af 6 ioii a ed in the necessaryto impart to the said forked lever a cerother frame pp rt This swinging movetain amount of extra, movement 50 that in this ment iS transmitted by means 0f bevel wheels manner space providing play is obtained between and 3 to a V a ly i li lo Sha t! and from so the stop member and the forked lever, over which this t r t B- swinging arm 12. A toothed rack space the said forked lever then moves back again l3 is Divotolly connected y means of a Pivot P so as to rest closely up against the stop member. rranged so asto be adju abl (th a ju This small backward movement of the forked merit not losing shown on drawin s) to the lever for the coupling necessitates however a swinging arm I! and engages W a pini n i backward movement of the friction coupling of Which is rigidly mounted on a s aft 6 1013- 35 0 corresponding magnitude, whereby t said nailed between the supports 34', 35'below the table 1 pling is also allowed a certain amount of play. 35 in the frame of he machine. As a conse- Inorder to obtain reliable and exact feeding of (11161108 of the motion of the sw the material to be cut it is, however, necessary a the Pinion and consequently also the 40 to maintain the movable part of the coupling shaft is have 6. rotary motion 01'. greater OfleSS 40 positively in its end position corresponding to mag tude imparted to m acc rd to t e the engagement of the coupling, in order to avoid adjustment of the piv pin M of the rack l3. any slipping action'on' the coupling. It is the On the Shaft a P o 9 engagin w th a principal object of the invention to attain this toothed oi'own Wheel ll Provided on bolt P end, With this'object in view according to the icy "a a d adapt d to be coupled by means of 45 invention a resilient or spring-controlled intera friction coupli is With t Shaft is o e y mediate member is inserted in the Iinkage'conmounted. When the pinion I9 is connected with trolling the coupling in such manner that the the shaft l6 by means of the coupling I8 the belt extra movement of the forked coupling lever pulley l'la participates in the rotary motion of necessary for the engagement of the stop arm thepinion l5 and thereby actuates by means of 0 is taken up by the said resilient intermediate an endless steel band 20 a saddle member ll-by member. As a result of this the movable part means of which the material to be cut is pushed of the coupling does not participate in the small forward on the operating table 36 in the direction backward movement of the forked lever into its towards thevknife 31a.

Position of rest against the stop lover. T e a d The engagement of the coupling I8 is effected n by means of a forked coupling lever 22 which is mounted so as to be capable of swinging by means of a pivot pin 22a. The forked coupling lever 22 is provided with an extension 23 against which one arm of a bell crank lever 24 adapted to swing about the pivot pin 22a presses through the medium of an intermediate compression spring 25. The movement of the bell crank-lever 24 is caused on the one hand by means of a pull rod 26 which pivotally connects the said bell crank lever 24 with a bell crank lever 21 pivoted at 21a, and a cam disc 28 mounted on the crank shaft 3 and provided with cams 28a which operate on an anti-friction roller 21b of the said bell crank lever 21, and on the other hand by means of a tension spring 32 acting on the pull rod 26.

The mode of operation of the automatic feeding device according to the invention is as follows: When the crank pin passes through one of its dead centres, the whole feeding mechanism and consequently also the pinion l5 remain for a short time at rest. During this period of rest the coupling I8 is brought into the position of engagement by means of the forked coupling lever 22 through the medium of cam 28a provided on the cam disc 28, the bell crank lever 21, the pull rod 28, the bell crank lever 24 and the compression spring 25. The bell crank lever 24 acts as a locking member and is maintained in its end position corresponding to the position of engagement of the coupling by means of a stop member 29, the locking projection of which comes into position in front of the one arm of the bell crank lever 24. A spring 29a which is arranged between the stop member and an extension 291) provided on a bearing bracket 290 of the stop member, presses the said stop member into the locking position. Inasmuch as the movement of the bell crank lever 24 is transmitted by means of the compression spring 25 to the forked lever 22, the spring 25 becomes compressed when extra movement of the bell crank lever 24 with regard to the coupling movement of the coupling l8 takes place, to a corresponding extent and thereby maintains the coupling in the completely engaged position in spite of the return movement of the bell crank lever 24 until stopped by the locking projection of the stop member. As a result of the half revolution of the crank pin up to its next dead centre the saddle member 2| is pushed forward by the feeding mechanism to an extent corresponding to the adjustment of the pivot pin H of the rack l3 on the swinging arm l2. When the crank pin I has arrived in its second dead centre position and the whole feeding mechanism thus again becomes station- ,ary for a short period, the bell crank lever 21 and consequently also the pull rod 26 are moved back through the action of the second cam provided on the cam disc 28. As the pull rod 26 is connected with the lever 24 through the medium of a slot the said lever 24 does not at first participate in the return movement of the said pull rod. During this part of the return movement of the pull rod 26 a cam 30 provided on the pull rod presses the stop member 29 back, whereby the lever 24 is released and is likewise enabled to execute a return movement. This movement is transmitted by means of the screw bolt 3| to the forked coupling lever 22 and thus also to the coupling I8 which is thereby disengaged. The coupling members are maintained in the position of disengagement by the tension spring 32 operating on the rod 26. During the succeeding second half rotation of the crank pin the belt pulley does not participate in the backward movement of the feeding mechanism in consequence of the disengagement of the coupling, and the saddle member 2| thus remains stationary. During this period the cutting movement of the knife 31a takes place.

The backward movement of the saddle member 2| is effected by turning the belt pulley backwards by hand or by mechanical means during the time when the machine is at rest. The resilient intermediate member, i. e. the spring ,25, which in the constructional form described by way of example is arranged between the forked coupling lever 22 and the bell crank lever 24 may also be arranged in another position, for example in the pull rod 26 or the bell crank lever 21. The only condition is that the said resilient intermediate member is located between the coupling and that part of the device for engagement, the motion of which is stopped by the stop member 29.

I claim:

1. In a cutting machine for paper, cardboard and the like, provided with an automatically operating device for intermittently feeding the material to be cut, comprising a coupling adapted to be engaged and disengaged during the intermittent periods of rest of the operating device, the combination of: co-operating movable and stationary friction coupling members; means acting upon said friction coupling members to bring them in and out of engagement with one another; a locking device adapted to secure said means in the position corresponding to engagement of said friction coupling members; a resilient member interposed between the movable friction coupling member and that member of said means which is engaged by the locking device; and means for automatically releasing said first-named means.

2. In a cutting machine for paper, cardboard and the like, provided with an automatically operating device for intermittently feeding the material to be cut, comprising a coupling adapted to be engaged and disengaged during the intermittent periods of rest of the operating device, the combination of: co-operating movable and stationary friction coupling members; means acting upon said friction coupling members to bring them in and out of engagement with one another said means comprising two levers loosely mounted relatively to one another; a compression spring interposed between said levers; and a locking member adapted to hold one of said levers positively in the position corresponding to engagement of said friction coupling members.

3. In a cutting machine for paper, cardboard and the like, provided with a device for automati-.

cally feeding the material to be cut by means of an intermittently operated feeding member comprising a coupling adapted to be engaged and dis-,

engaged during the intermittent periods of rest, the combination of: a friction coupling device; a forked lever operatively associated with said friction coupling device; a spring-controlled bell crank lever operatively associated with said forked lever by means of the spring control which is'interposed between the two levers; a stop member pivoted to the framework of the machine and limiting the movement of said bell crank lever'; and a spring controlled rod operatively connected with said bell crank lever and the drive of the machine, substantially as described.

GERHARD scHMm'r. 

